Electric toothbrush



FIG. 1 is a front elevation of an electric toothbrush showing my new design;

FIG. 2 is a left side elevation view thereof, the right side being a mirror image; and,

FIG. 3 is a back elevation view thereof.

The portions shown in broken lines are for illustrative purposes only and form no part of the claimed. 

The ornamental design for an electric toothbrush, as shown and described. 